/Engine/Source/Runtime/SlateCore/Public/Textures/TextureAtlas.h
When a slot is occupied by texture data, the remaining space in the slot (if big enough) is split off into two new (smaller) slots, building a tree of texture rectangles which, instead of being stored as a tree, are flattened into two linked-lists:
struct FAtlasedTextureSlot : public [TIntrusiveLinkedList< FAtlasedTextureSlot >](API\Runtime\Core\Containers\TIntrusiveLinkedList)
uint32
Height
The height of the character
uint8
Padding
Uniform Padding. can only be zero or one. See ESlateTextureAtlasPaddingStyle.
uint32
Width
The width of the character
uint32
X
The X position of the character in the texture
uint32
Y
The Y position of the character in the texture